Dual Fuel Engine
DF or Duel Fuel Engines are the kind of engines which can run on a mixture of diesel fuel and gas fuel or it could work on diesel fuel alone. Duel Fuel engines are not able to run on gas alone because they do not posses an ignition system, nor do they possess any spark plugs.

Since the engine is not a pure diesel engine and diesel is not a pure gas, this equipment does suffer from poor fuel efficiency and Methane slippage. For example, the fuel efficiency could be 5% to 8% less than in a comparable lean-burn, spark-ignited engine at 100 percent load. It can even be greater on lower loads.

Lift Truck Classification and Fuel Sources
There are some recycling materials handling applications which can prove very challenging for lift trucks. Like for instance, scrap metal is among these problems. In order to successfully handle things like this needs utilizing the correct kind of machine for the task.

In this write-up, the 7 major lift truck classes are discussed, including the power sources such as hydrogen fuel cell, liquid propane gas, gasoline, diesel and electric. The power source is linked to several of these specific classes. The main power sources for forklifts consist of Battery, Diesel, Gasoline, Fuel Cell and Propane.

Electric powered trucks are the most common, mostly Class III, III and class I forklifts. Internal combustion engines are more common in Classes IV and V. The most common electric power source is the lead-acid battery. Among internal combustion trucks, around more than 90% are powered by propane.

The most common power source for lift trucks is battery. Battery powered units make up around 60% of the new forklifts sold within the USA. Their benefits consist of: quiet operation, less maintenance requirements, the ability to be used outdoors and indoors with no harmful emissions.